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Montana Field Guide

Montana Field Guides

Bog Yellowcress - Rorippa palustris
Other Names:  Rorippa islandica

Native Species

Global Rank: G5
State Rank: SNR

Agency Status
MNPS Threat Rank:
C-value: 4

External Links

General Description
Taprooted annual to short-lived perennial. Stems usually erect, 10–100 cm. Leaves basal and cauline; the lower leaves 3–15 cm long, petiolate, auriculate-clasping, oblanceolate, pinnately lobed and dentate; upper leaves similar, smaller, less divided and toothed. Vestiture of sparse, simple hairs below or plants glabrous. Petals yellow, 1.5–3 mm long. Fruit an ovoid silicle, 2–5 × 2–3 mm, glabrous; style 0.3–1 mm long; pedicels spreading, 3–10 mm long, longer than the silicle (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Montana has varieties palustris, hispida (Desv.) Butters & Abbe, and fernaldiana Butters & Abbe

Species Range
Montana Range


Range Comments
Throughout most of North America (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Observations in Montana Natural Heritage Program Database
Number of Observations: 34

(Click on the following maps and charts to see full sized version) Map Help and Descriptions
Relative Density



(Observations spanning multiple months or years are excluded from time charts)

Wet, often disturbed soil of fields, roadsides and along streams, wetlands; plains, valleys, montane (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

The following animal species have been reported as pollinators of this plant species or its genus where their geographic ranges overlap: Bombus rufocinctus (Thorp et al. 1983).

  • Literature Cited AboveLegend:   View Online Publication
    • Thorp, R.W., D.S. Horning, and L.L. Dunning. 1983. Bumble bees and cuckoo bumble bees of California (Hymenoptera: Apidae). Bulletin of the California Insect Survey 23:1-79.
  • Additional ReferencesLegend:   View Online Publication
    Do you know of a citation we're missing?
    • Ament, R.J. 1995. Pioneer Plant Communities Five Years After the 1988 Yellowstone Fires. M.Sc. Thesis. Bozeman, MT: Montana State University. 216 p.
    • Jorgensen, H.E. 1970. Ecological aspects of the life history of Agropyron smithii Rydb. in Central Montana, with related effects of selective herbicide treatments of rangeland. Ph.D. Dissertation. Bozeman, MT: Montana State University. 118 p.
    • Lesica, P., M.T. Lavin, and P.F. Stickney. 2012. Manual of Montana Vascular Plants. Fort Worth, TX: BRIT Press. viii + 771 p.
    • Tschache, O.P. 1970. Effects of ecological changes induced by various sagebrush control techniques on small mammal populations. M.Sc. Thesis. Bozeman, MT: Montana State University. 51 p.
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Citation for data on this website:
Bog Yellowcress — Rorippa palustris.  Montana Field Guide.  .  Retrieved on , from